I have had both, both can be very good, the problem, in my opinion, comes in because to make a very nice direct drive, and there are several, the motor expense goes up, without a good direct drive motor you really have some noise and speed issues, however with a very good motor you have an exceptional turntable. It takes in a lot less cost to put a synchronous motor and belt pulley system in than to go to the expense of a direct driven motor and control system.
From a vintage stand point it is easier for us to keep a belt driven system functioning due to the availabilty of correct/suitable replacement parts.
Neither is better or worse, there may be a cost difference to get to the level you desire.
Just my thoughts.
Jim